The prothallus of Polystichum

Nayar, B. K. ; Kaur, Surjit ; Chandra, Prakash (1969) The prothallus of Polystichum Proceedings of the Indian Academy of Sciences, Section B, 69 (4). pp. 198-202. ISSN 0370-0097

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In the 9 spp. of Polystichum studied, a uniseriate germ filament is produced on spore germination. The anterior cells of the germ filament develop into a prothallial plate commonly before or sometimes after the terminal cell develops a papillate hair. A meristematic cell is differentiated early during plate formation, commonly in one of the daughter cells of the terminal cell or rarely (when the terminal cell is quiescent and hair-bearing as in P. aculeatum and P. lentum) of the penultimate cell. Young thalli become cordate in c. 8 weeks from spore germination and fully grown inc. 3 months. The mature prothallus is profusely hairy and cordate with a thick midrib and spread-out wings. Hairs are of the capped, unicellular, papillate type; a few club-shaped, unicellular hairs devoid of terminal caps are found in addition on the anterior margin. Sex organs are of the usual leptosporangiate type. The antheridium dehisces by a pore-like opening formed in the cap cell.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
ID Code:24619
Deposited On:29 Nov 2010 09:13
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